Bill McKibben: Renewable Energy Is Now a Tool to Slow Climate Change

In a new interview, climate author and activist Bill McKibben talked about the growing power of renewable energy, saying that cheap solar, wind and battery technology could help slow global warming — even if it cannot stop it completely. McKibben’s comments come as the world sees historic growth in clean energy but still battles political and economic challenges. 

McKibben, who wrote The End of Nature in 1989 — one of the first books on climate change — has spent nearly four decades warning about rising temperatures. In his new book Here Comes the Sun, he explores how renewable energy has finally become powerful and affordable enough to change the climate story. 

A Tool We Finally Have

McKibben said the world now has a tool that can reduce some degree of future warming — a change that wasn’t possible decades ago. He explained that while renewables alone can’t stop climate change, they can keep the planet from heating as much as it otherwise would.

“We finally have a tool to at least shave some tenths of a degree off how hot the planet gets,” McKibben said.

He pointed to the massive expansion of clean energy infrastructure:

• Around 95 % of all new electricity generating capacity installed worldwide last year came from solar, wind and other renewables.

This growth means clean energy is not just a future idea but a technology that is helping replace fossil fuels now. McKibben said this could have real effects on future climate outcomes.

Why This Matters

Renewable energy — especially solar and wind — has become much cheaper and more effective than ever before. Batteries that store electricity are also improving fast, helping renewable power work even when the sun isn’t shining and the wind isn’t blowing. McKibben says this combination finally gives the world a practical way to power modern society without relying so much on fossil fuels.

For example:

• Solar panel costs have dropped dramatically over the past decade.
• Battery storage systems are more widespread, helping electricity grids run on renewables even at night.
• Solar and wind projects have spread quickly in countries like China, Texas, and parts of Europe thanks to high demand and investment.

McKibben has recently toured the U.S. talking up this renewable revolution, including events where he discusses how solar and wind power could reshape global energy and climate outcomes.

McKibben’s View on Climate Risks

Although McKibben’s tone in the interview was more hopeful than in his earliest years, he did not say the climate problem is solved. Far from it. He stressed that:

• The planet is already warming fast.
• Climate disasters — like heatwaves, flooding and storms — are happening now and will continue without action.
• Renewable energy alone won’t reverse climate change, but it can limit how much worse it gets.

He also warned about political and policy setbacks that could slow progress, especially in countries where leaders are rolling back clean energy support. Some analysts note that in 2025, parts of the U.S. federal government cut climate funding and blocked clean energy rules even as renewables grew worldwide. 

McKibben argued that economic forces, not just government policy, are driving the growth of renewables — because clean energy is now cost-competitive compared with coal, gas, and oil.

Global Clean Energy Trends

McKibben highlighted several major trends that give him cautious hope:

• Solar and wind power have surpassed coal as global leaders in new electricity generation.
• Countries like China and some U.S. states are installing renewables faster than ever.
• Battery storage is reducing one of the biggest limits of solar and wind.
• Even with some political pushback, the transition to clean energy is now driven by economics, not just climate policy. 

McKibben said that a real global energy transition must include faster expansion of renewables and the retirement of fossil fuels, and that billions more in investment and political will are needed if the world hopes to slow warming significantly. 

Renewable Growth Doesn’t Mean All Problems Are Solved

Despite strong progress, McKibben and other experts agree that:

• Renewable power still needs better transmission grids and more storage to fully replace fossil fuels.
• Some nations still rely heavily on coal and gas and haven’t shifted nearly fast enough.
• Clean energy growth must be paired with reducing total emissions, not just adding low-carbon power.

Critics of the current energy transition also argue that renewable growth alone is not enough, and that without cutting fossil fuel use significantly, emissions and climate harms continue to climb.

Bottom Line

Bill McKibben’s latest interview shows a mixed but clearer picture of our climate moment: the world finally has a real tool — renewable energy — that can limit future warming even if it cannot stop climate change completely. McKibben’s message is one of cautious hope, based on historic growth in clean power and new economic drivers that make solar and wind cheaper than fossil fuels. But he warns that renewable energy must expand faster and be paired with stronger political action to have the biggest climate impact.